Name Period Date. Record all givens, draw a picture, arrow all vectors, write the formula, substitute and solve. units
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1 Example Problems 12.1 E1. Doc Fizzix, whose mass is 65.0 kg, is doing a physics demonstration at the front of the classroom. How much gravitational force does Doc Fizzix exert on Rob, whose mass is 55 kg, sitting in the front row 1.00 meters away? E2. From the previous problem, how much force does Doc Fizzix, who s mass is 65 kg, exerts on Zarrick, who s mass is 55 kg, sitting 4.00 meters away in the back row? 1
2 E3. Doc Fizzix once told his wife that she married him because of the strong gravitational attraction he exerts on her. If Doc Fizzix has a mass of 65 kg and his wife has a mass of 45 kg, calculate the gravitational force between the two when they are 0.5 m apart. E4. The planet Mars has a mass of x kg and a radius of 3,397,000 m. How much would a 70.0-kg astronaut weigh if they were to stand on the surface of Mars? 2
3 E5. An 80,000 kg space shuttle is in an orbit 500 km above the earth s surface. Determine the gravitational force holding it in orbit. [Earth s radius is 6,371,000 meters] E6. A neutron star, mass 2 x kg, is a very compact star having a mass comparable to the sun but a radius of only a few kilometers (10 km). Calculate the acceleration of gravity on the surface of this neutron star. If it was possible to stand on the surface of the star, calculate your weigh on the surface assuming your mass was 55 kg. g p = M p = r p = b) 3
4 E7. A satellite is placed in an orbit 16,090,000 meters above the Earth s Surface. How fast is the satellite traveling to remain in orbit? v = M p = r p = E8. A space ship is to orbit a planet with a mass of 8 X kg. How far, from the plant s center, must the ship travel if it is to travel with a velocity 10,000 m/s? v = M p = r p = 4
5 Student Problems A monkey is sitting next to you on a park bench. Lets assume that your mass is 60-kg and the mass of the monkey is 45-kg. If the distance between your centers is 0.75 m, what is the gravitational force of attraction between you and this monkey? 2. A large gorilla whose mass is 87.0 kg is doing a physics demonstration in the front of the classroom. How much gravitational force does he exert on a 45.0-kg monkey in the second row, 2.50 meters away? 5
6 3. The planet Jupiter has a mass of x kg and a radius of 6.99 x 10 7 m. How much would a 70.0-kg astronaut weigh if they were to stand on the surface of Jupiter? 4. Find the gravitational force of attraction between the Earth and the Moon. The moon has a mass of 7.35 x kg, the Earth has a mass of 5.98 x kg, and the distance between the two is 3.84 x 10 8 m. 6
7 5. The gravitational force of attraction between two monkeys sitting at their desks in physics class is 3.20 x 10-8 N. If one monkeys has a mass of 53.0 kg and the other monkeys has a mass of 68.0 kg, how far apart are the two monkeys sitting? 6. Your secret admirer is sitting near you in the classroom right now as you read this problem. Not only are they attracted to you because of your good looks but there is also a gravitational force of 7.94 x 10-7 N. If you have a mass of 62.0 kg and the person you are attracted to has a mass of 48.0 kg, how far away are you sitting from this person and who is it? 7
8 7. How high above the surface of the Earth would you have to lift a 1-kg mass so that the gravitational force between the mass and the Earth was 1-N? [Hint: subtract the distance to the Earth s center from your answer. Distance to Earth s center is 6,380,000 meters] 8. A hypothetical planet of apes has a radius 2.5 times that of Earth, but has the same mass. Calculate the acceleration of gravity at the surface and calculate the weight of a 65 kg man. [The Earth has a radius 6,380,000 meters and a mass of 5.98 x kg] g p = M p = r p = b) 8
9 9. The Hubble Telescope orbits the Earth 598 km above the surface. How fast is it traveling to stay in its stable orbit? [The Earth has a radius 6,380,000 meters] v = M p = r p = 10. A communications satellite stays in the same spot in the sky above the Earth s surface. It also takes 24 hours to complete a single orbit -just like the Earth s rotation. This orbit is unique and called a geosynchonous orbit. How high above the Earth s surface is the satellite orbiting? [The Earth has a radius 6,380,000 meters] v = M p = r p = 9
10 10
11 Monkey Busters What is the force of gravitational attraction between two uniform spheres, each having a mass of 12 kg and a diameter of 0.4 meters, when they just touch? 12. What is the acceleration of gravity 9600 km above the surface of the earth? 11
12 13. At what altitude above the Earth s surface would the acceleration of gravity be 4.9 m/s²? 14. A distance of 0.2 cm separates two objects of equal mass. If the gravitational force between them is N, find the mass of each object. 12
13 15. If the gravitational field strength at the top of Mount Everest is m/s², approximately how tall (in feet) is the mountain? 16. A space probe lands on the surface of a spherical asteroid 250 miles in diameter and measures the strength of its gravitational field at that point to be 4.95 x m/s². What is the mass of the asteroid? 13
14 17. What is the orbit radius of a 300 kg satellite that completes one circular orbit about Earth once each 3.6 hrs? What is the gravitational force that acts on this satellite? b) 18. At what point between Earth and Moon is the net gravitational attraction on an object due to these two bodies exactly zero? 14
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